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FBI searching for ISIL militant with ‘North American accent’ who appeared in execution videos

American intelligence authorities are hunting an ISIL militant believed to be of North American origin who appeared in a video depicting the execution of Syrian soldiers.

The FBI has appealed for public help in identifying the man, releasing an excerpt from the propaganda clip along with a statement on its website.

“Dressed in desert camouflage and wearing a shoulder holster, the masked man can be seen standing in front of purported prisoners as they dig their own graves and then later presiding over their executions,” the statement read.

“The man has what is believed to be a North American accent.”

The 55-minute ISIL video was released on September 19 and shows the extremist soldier alternating between Arabic and English as he warns of future executions.

The FBI has called for public information in their hunt for the man. (Supplied) ()

FBI officials had previously said they believed around a dozen Americans are fighting with ISIL and have now appealed for public information following the video’s release.

“We need the public's assistance in identifying U.S. persons going to fight overseas with terrorist groups or who are returning home from fighting overseas,” said Michael Steinbach, assistant director of the FBI’s Counterterrorism Division.

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“We’re hoping that someone might recognize this individual and provide us with key pieces of information,” Mr Steinbach said.

“No piece of information is too small.”

A number of US citizens have been arrested for attempting to join jihadist fighting in the Middle East.

On Saturday, a 19-year-old Chicago man was arrested for allegedly planning to travel overseas to fight with ISIL, while last year, a Brooklyn man was sentenced to 15 years’ jail for attempting to travel to Pakistan to fight for extremist causes.

The manhunt comes as Western authorities continue their search for the masked British executioner of US journalists James Foley and Steven Sotloff and British aid workers David Haines and Alan Henning in graphic beheading videos.